Rmprovement in pipe-stems



UNITED STATES PATENT OFFICE.

JONATHAN DAVIS, OF ST. PAUL, MINNESOTA. i

IMPROVEMENT IN PIPE-STEMS.

Specification forming part of Letters Patent No. 139,880, dated June 17, 1873; application filed October 16, 1872.

To all whom it may concern:

Beit known that I, JONATHAN DAVIS, of St. Paul, in the county of Ramsey and State of Minnesota, have invented certain Improvements in Pipe-Stems, of which the following is a specification:

This invention consists in the combination, with the outer stem of a pipe, ot' a tube having spiral grooves on its periphery arranged within said stem, whereby the smoke will pass up through one spiral groove and down through the other, and then into the tube at about the center thereof', from which it passes to the mouth, the object and purpose of which will be fully hereinafter described.

In the drawings, Figure l shows one form of my stem, and Figs. 2 and 3 another.

A is a cylinder, which I prefer to make slightly conical, as shown, in order that the part B may it tightly within it. B is a tube, closed at 'the bottom and provided with a spiral groove, a, which starts from a chamber, C, in the lower part of the stem, and passes up to the upper portion ot' the cylinder A, where it turns, and, as shown at b, descends to near the bottom of the tube B, where a perforation connects it with the interior. Dis the mouth-piece, attached in the usual manner to the tube B. E is the pipe, shown as connected (in Fig. 1) by a perforated stem, e. Gis a cap, covering the bottom of the stem and made removable, to discharge any accretions of oil. gis a stay to strengthen the connection between the stem and the pipe.

The smoke from the pipe'passes into the chamber C, and from thence up through ther groove a and back through groove b' to the center of the tube B, from which it is drawn into the mouth.`

The tube may be made of wood, or some` absorbent material, like-plaster or clay, 4and y taken out when foul and replaced by a new p one; or it may be made of some substance which can be easily cleaned. The short dstem e can also be readily removed and replaced.

With a common style of pipe I lengthen the cylinder A and insert an ordinary stem in it,

as shown in Figs. 2 and 3.

I am aware that pipestems have been made with grooves running around the inner part; from the chamber at the bottom to the mouthi v piece at the top, the wholecourse being as-w' cending; but this I do not claim. I am also aware that a pipe-stem has been provided with a tube having two or more vertical channels,

whereby the smoke will first pass up one chan nel and down the otherto the bottom ot' the tube, and then pass into the stem to the mouth Witnesses:

CEAS. F. SLEEPER, P. HEFFEMAN.' 

